A Study About The Classification Of Efficiency Of Electret Filtrate Material's To The FPM By Experiments

With the improvement of science and technology, people's standard of living has improved gradually and people are paying more and more attention to the health of themselves, but the airborne contamination is becoming worse too, all of these lead to a contradiction between the people's recognition on theire health and the deterioration of the air quality.Now the IP(Inhalable Particles) has become the uppermost contamination in the atmosphere in our country and do more harm to our health. More rigorous condition were required for the indoor air environment where the concentration of IP is high and people stay more time in, so we should pay more attention to the indoor IP concentration than that of out door. As one of the most effective and economical methods which can reduce the concentration of IP , the way of air filtration has gained more attention from all circles and some research has began gradually. The Filtration material is the hard core of the whole system, its performance influence the effect of filtration system directly, so the research on it is the most important.Normally, we use the PM₁₀ which was executed in 2003 as the index of IP's concentration in the comfortable indoor environment. But with the deep development of research , we found a derection that the object has changed to the more tiny than now. Such as in USA, the standard of PM_2.5 which is more strict than PM₁₀ has applied according to the different area and the different period of time from this year. So we can say that with the popularity of the standard PM10 in our country and the development of standard PM2.5 in Europe and American , the establishment and spread of the later standard will carry out sooner or later.Now we usually use the low-efficiency in the air filtration system and sometime use the middle-efficiency, but both of this played a unimportant part to the PM10 and nearly useless to the PM_2.5, although the high-efficiency filtration material is good ,but the higher resistance will cost more energy, so it seldom be used in the comfortable air filtration system. From all of this we found it's urgent to pick up a kind of new filtration material to purifying the IP and to protect our health.The Electret filtration material has been recognized by more and more people for it's great performance, but there is still no conclusion that if it's useful for the comfortable air environment, because the experiments about the performance are few. In this paper ,we have done a great deal of experiments to test the efficiency of electret filtration material to the IP. In order to get a more exact result, at first, we picked up some public buildings and office to monitor and then we analyzed those data to educe a significative conclision which can be the foundation of this researchFor applying the electret filtration material to project as soon as posible, in this paper, according to the information surveyed, we build a model of IP's concentration under different melthod of air-filtration, then obtain some formulas such as the instantaneous concentration, steady concentration, time of filtration and so on, take the result which had obtained before to those formulas and analyzed. From those, we found that electret filtration material is better than the low or middle filtration material, and I hope all of these conclusion will be helpful to the application of electret filtration material so as to gain the final aim of protecting people's health.